60   inline bool empty() const { return agent_ == nullptr; }  in empty()
68   inline Agent* agent() { return agent_; }  in agent()
76   inline AgentWriterHandle(Agent* agent, int id) : agent_(agent), id_(id) {}  in AgentWriterHandle()
78   Agent* agent_ = nullptr;  variable
159   if (agent_ != nullptr)  in reset()
160     agent_->Disconnect(id_);  in reset()
161   agent_ = nullptr;  in reset()
166   agent_ = other.agent_;
168   other.agent_ = nullptr;
177   if (agent_ != nullptr) agent_->Enable(id_, categories);  in Enable()
181   if (agent_ != nullptr) agent_->Disable(id_, categories);  in Disable()
185   return agent_ != nullptr && id_ == Agent::kDefaultHandleId;  in IsDefaultHandle()
189   return agent_ != nullptr ? agent_->GetTracingController() : nullptr;  in GetTracingController()